periderm
Periderm is the secondary dermal tissue on
stems and branches of woody plants. The periderm is developing when the
epidermis (primary dermal tissue) rips due to secondary growth. The periderm is mostly smooth and slightly structured. At maturity, it is typically replaced by the
bark (tertiary dermal tissue) in most
species. The periderm remains for a long time only in few
species (e. g. in
Fagus – Beech).
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